-48.62% is the change from 545 to 280
Calculation steps:
[( 280 - 545 ) ÷ 545] x 100 = -48.62%
Formula
Percentage change = [(280 - 545) / 545] x 100
Subtract the new number by the original number
280 - 545 = -265
-265 ÷ 545 = -0.48623853211009177
-0.48623853211009177 x 100 = -48.62%